I imported 60 different GPX tracks from RunKeeper into my database, using this hack. I’ve been dorking around with the data using TileMill as a sort of GIS app; it’s nicer than QGIS! But it’s silly for me to try to draw my own complete map from OSM data, as fun as that is, so I’ll probably switch to some GeoJSON overlay on top of a slippy map with nice terrain tiles next. Anyway, here’s a map of just the walks and then parks in SF.
I like the way the transparency + the GPS noise naturally shows streets I walk on more frequently.